Arthur J. Gallagher & Co.
MX ˙ BMV ˙ US3635761097
SecurityMX:AJG / Arthur J. Gallagher & Co.
InstitutionJanney Montgomery Scott LLC
Latest Disclosed Ownership22,462 shares
Latest Disclosed Value $ 4,865
Janney Montgomery Scott LLC reports 43.24% decrease in ownership of AJG / Arthur J. Gallagher & Co.

On April 22, 2026 - Janney Montgomery Scott LLC filed a 13F-HR form disclosing ownership of 22,462 shares of Arthur J. Gallagher & Co. (MX:AJG) valued at $4,865 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 11, 2026 disclosing 39,577 shares of Arthur J. Gallagher & Co.. This represents a change in shares of -43.24% during the quarter.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-04-22 2026-03-31 13F ARTHUR J GALLAGHER Common Stock 363576109 22,462 -17,115 -43.24 5 -60.00 0.0120
2026-02-11 2025-12-31 13F ARTHUR J GALLAGHER Common Stock 363576109 39,577 -23,791 -37.54 10 -47.37 0.0235
2025-10-27 2025-09-30 13F ARTHUR J GALLAGHER Common Stock 363576109 63,368 339 0.54 20 -5.00 0.0465
2025-07-17 2025-06-30 13F ARTHUR J GALLAGHER Common Stock 363576109 63,029 31,257 98.38 20 100.00 0.0527
2025-04-17 2025-03-31 13F ARTHUR J GALLAGHER Common Stock 363576109 31,772 1,727 5.75 11 25.00 0.0311
2025-01-17 2024-12-31 13F ARTHUR J GALLAGHER Common Stock 363576109 30,045 -292 -0.96 9 0.00 0.0236
2024-10-29 2024-09-30 13F ARTHUR J GALLAGHER Common Stock 363576109 30,337 20 0.07 9 14.29 0.0238
2024-07-25 2024-06-30 13F ARTHUR J GALLAGHER Common Stock 363576109 30,317 5,874 24.03 8 16.67 0.0240
2024-05-01 2024-03-31 13F ARTHUR J GALLAGHER Common Stock 363576109 24,443 2,031 9.06 6 20.00 0.0182
2024-02-08 2023-12-31 13F ARTHUR J GALLAGHER Common Stock 363576109 22,412 967 4.51 5 25.00 0.0164
2023-11-08 2023-09-30 13F ARTHUR J GALLAGHER Common Stock 363576109 21,445 2,698 14.39 5 0.00 0.0182
2023-07-26 2023-06-30 13F ARTHUR J GALLAGHER Common Stock 363576109 18,747 2,342 14.28 4 33.33 0.0144
2023-04-28 2023-03-31 13F ARTHUR J GALLAGHER Common Stock 363576109 16,405 2,082 14.54 3 50.00 0.0128
2023-02-01 2022-12-31 13F ARTHUR J GALLAGHER Common Stock 363576109 14,323 -499 -3.37 3 -99.92 0.0105
2022-10-25 2022-09-30 13F ARTHUR J GALLAGHER Common Stock 363576109 14,822 -14 -0.09 2,538 4.88 0.0109
2022-08-03 2022-06-30 13F ARTHUR J GALLAGHER Common Stock 363576109 14,836 263 1.80 2,420 -4.87 0.0109
2022-05-04 2022-03-31 13F FISERV Common Stock 363576109 14,573 -3,072 -17.41 2,544 -15.03 0.0109
2022-01-27 2021-12-31 13F ARTHUR J GALLAGHER Common Stock 363576109 17,645 3,090 21.23 2,994 38.35 0.0116
2021-10-29 2021-09-30 13F ARTHUR J GALLAGHER Common Stock 363576109 14,555 2,243 18.22 2,164 25.45 0.0093
2021-07-26 2021-06-30 13F ARTHUR J GALLAGHER Common Stock 363576109 12,312 -521 -4.06 1,725 7.75 0.0076
2021-04-27 2021-03-31 13F ARTHUR J GALLAGHER Common Stock 363576109 12,833 -325 -2.47 1,601 -1.66 0.0078
2021-01-25 2020-12-31 13F ARTHUR J GALLAGHER Common Stock 363576109 13,158 95 0.73 1,628 18.06 0.0079
2020-11-06 2020-09-30 13F ARTHUR J GALLAGHER Common Stock 363576109 13,063 2,955 29.23 1,379 40.00 0.0079
2020-07-23 2020-06-30 13F ARTHUR J GALLAGHER Common Stock 363576109 10,108 928 10.11 985 31.68 0.0062
2020-04-30 2020-03-31 13F ARTHUR J GALLAGHER Common Stock 363576109 9,180 -267 -2.83 748 -16.89 0.0059
2020-01-21 2019-12-31 13F ARTHUR J GALLAGHER Common Stock 363576109 9,447 -70 -0.74 900 5.63 0.0059
2019-10-29 2019-09-30 13F ARTHUR J GALLAGHER Common Stock 363576109 9,517 -464 -4.65 852 -2.52 0.0062
2019-07-29 2019-06-30 13F ARTHUR J GALLAGHER Common Stock 363576109 9,981 161 1.64 874 13.95 0.0067
2019-04-30 2019-03-31 13F/A-1 ARTHUR J GALLAGHER Common Stock 363576109 9,820 896 10.04 767 16.57 0.0063
2019-04-30 2019-03-31 13F ARTHUR J GALLAGHER Common Stock 363576109 8,924 0 658
2019-02-01 2018-12-31 13F ARTHUR J GALLAGHER Common Stock 363576109 8,924 1,084 13.83 658 12.67 0.0063
2018-11-05 2018-09-30 13F ARTHUR J GALLAGHER Common Stock 363576109 7,840 16 0.20 584 14.29 0.0050
2018-07-24 2018-06-30 13F ARTHUR J GALLAGHER Common Stock 363576109 7,824 -583 -6.93 511 -11.59 0.0049
2018-04-19 2018-03-31 13F ARTHUR J GALLAGHER Common Stock 363576109 8,407 999 13.49 578 23.24 0.0058
2018-02-14 2017-12-31 13F ARTHUR J GALLAGHER Common Stock 363576109 7,408 38 0.52 469 3.30 0.0049
2017-11-15 2017-09-30 13F ARTHUR J GALLAGHER Common Stock 363576109 7,370 282 3.98 454 11.82 0.0052
2017-07-27 2017-06-30 13F ARTHUR J GALLAGHER Common Stock 363576109 7,088 555 8.50 406 10.03 0.0051
2017-04-26 2017-03-31 13F ARTHUR J GALLAGHER Common Stock 363576109 6,533 -6,035 -48.02 369 -43.49 0.0049
2017-02-13 2016-12-31 13F ARTHUR J GALLAGHER Common Stock 363576109 12,568 -9,474 -42.98 653 -41.75 0.0098
2016-11-14 2016-09-30 13F ARTHUR J GALLAGHER Common Stock 363576109 22,042 -21,492 -49.37 1,121 -45.90 0.0197
2016-08-11 2016-06-30 13F/A-1 ARTHUR J GALLAGHER Common Stock 363576109 43,534 23,684 119.31 2,072 134.65 0.0422
2016-08-05 2016-06-30 13F ARTHUR J GALLAGHER Common Stock 363576109 41,062 1,826
2016-05-10 2016-03-31 13F ARTHUR J GALLAGHER Common Stock 363576109 19,850 555 2.88 883 11.77 0.0231
2016-02-19 2015-12-31 13F ARTHUR J GALLAGHER Common Stock 363576109 19,295 832 4.51 790 3.67 0.0204
2015-11-16 2015-09-30 13F ARTHUR J GALLAGHER Common Stock 363576109 18,463 -1,127 -5.75 762 -17.71 0.0215
2015-08-04 2015-06-30 13F ARTHUR J GALLAGHER Common Stock 363576109 19,590 -199 -1.01 927 0.11 0.0194
2015-05-12 2015-03-31 13F/A-1 ARTHUR J GALLAGHER Common Stock 363576109 19,789 6,056 44.10 925 43.19 0.0172
2015-04-30 2015-03-31 13F ARTHUR J GALLAGHER Common Stock 363576109 19,789 925
2015-02-10 2014-12-31 13F ARTHUR J GALLAGHER Common Stock 363576109 13,733 567 4.31 647 8.21 0.0129
2014-11-14 2014-09-30 13F ARTHUR J GALLAGHER Common Stock 363576109 13,166 2,337 21.58 597 18.45 0.0124
2014-08-13 2014-06-30 13F ARTHUR J GALLAGHER Common Stock 363576109 10,829 477 4.61 505 2.44 0.0110
2014-05-14 2014-03-31 13F ARTHUR J GALLAGHER Common Stock 363576109 10,352 1,075 11.59 493 13.10 0.0119
2014-02-19 2013-12-31 13F ARTHUR J GALLAGHER Common Stock 363576109 9,277 0 0.00 435 -99.89 0.0115
2013-11-14 2013-09-30 13F ARTHUR J GALLAGHER Common Stock 363576109 9,277 47 0.51 404,941 0.42 0.0122
2013-08-13 2013-06-30 13F GALLAGHER ARTHUR J COMMON 363576109 9,230 9,230 403,259 0.0421
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.